Take-up and rewind assembly for motion picture projectors



July 26, 1938. Q, w 2,124,938

TAKE-UP AND REWIND ASSEMBLY FOR MOTION PICTURE PROJECTORS Filed Dec. 17, 1956 4 Sheets-Sheet l FIG.1. 1 69 flllII/lllllllllllllllll. 'IIIIIIIIIIIIIIIII 7111',

0H0 WiITel W 1;; ENTOR.

Mi W

ATTORNEYS July 26, 1938. o, wry- 2,124,938

TAKE-UP AND REWIND ASSEMBLY FOR MOTION PICTURE PROJECTORS Filed Dec. 17, 1936 4 Sheets-Sheet 2 FIG.4. FIG.5.

0H0 WilTel BY W - flaw/5%? A TTORI-JE Y5 July 26, 1938. o. WITTEL 2,124,938 TAKE-UP AND REWIND ASSEMBLY FOR MOTION PICTURE PROJECTORS Filed Dec. 17, 1936 4 Sheets-Sheet a FIG] Otto Wiztel IN VENTOR.

ATTORNEYS July 26, 1938. wn- 2,124,938

TAKE-UP AND REWIND ASSEMBLY FOR MOTION PICTURE PROJECTORS Filed Dec. 17, 1936 4 Sheets-Sheet 4 F/G. 8 F/G. 9

alum my INVENTOR 7mm 7% ATTORNEYS Patented My 26, 1938 2,124,938

UNITED STATES PATENT OFFICE TAKE-UP REWIND ASSEMBLY FOR MOTION PICTURE PROJECTORS Otto Wittel, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application December 17, 1936', Serial No. 116,362 12 Claims. (Cl. 242-55) This invention relates to motion picture prowhich may, or may not be great enough to snap jectors wherein the take-up reel is frictionally it depending upon the magnitude of the rise and driven and normally supported by its driving fall of the take-up reel. means, and particularly to a control means by It is also necessary in a projector wherein a means of which the frictional engagement beso called floating take-up reel is supported by 5 tween the take-up reel and its driving means can the driving belt therefor to provide a supplebe relieved during rewinding, said control means mentary supporting means for the reel which also serving to start and stop the rewinding opwill take effect in the event that the driving belt eration. breaks or jumps a pulley.

1 It is old in the art to mount the take-up reel Therefore, one object of my invention is to of a projector in such a way that it is normally provide a motion picture projector, wherein the supported by a belt which serves as a driving take-up reel is pivotally mounted to float and be means therefor. In a projector wherein the takenormally supported by a driving belt, with a conup reel is mounted in this manner, the frictional necting means between the take-up reel and the contact between the take-up reel driving memlever for starting and stopping the rewinding op- 15 ber, usually a pulley, and the belt varies with the eration, by means of which the frictional drag amount of film contained on the reel, a feature on the take-up reel caused by the belt can be which makes this method of mounting a frictionrelieved during rewinding. ally driven take-up reel very advantageous. It Another object is to provide a means for preis obvious that when large reels are used on a venting the take-up reel from flying upwardly 20 projector, i. e., 1,600 ft., wherein the combined during rewinding in the event a momentary drag weight of the reel and the fllm contained thereon is placed on the take-up reel. may amount to as much as 8 to 10 pounds, the And still another object is to provide a supplefrictional contact between the pulley connected mentary supporting means for the take-up reel to the reel and the belt can become quite sigwhich will become eflective only in case the driv- 25 nificant. ing belt normally supporting the reel should When rewinding on a projector of this type, break or jump a pulley. the frictional contact between the take-up reel I have shown my invention incorporated on a and its driving belt becomes a drag which has to motion picture projector shown and described in be overcome, and this frictional drag in combipending U. S. application Serial No. 74,330 in the 30 nation with the moment of inertia of the reel name of E. C. Fritts, now Patent No. 2,099,299

and its contents will place an unbearable strain of November 16, 1937 wherein the take-up reel is on the film strip between the supply reel and the pivotally mounted on the projector housing to take-up reel unless some means are provided for float and be normally supported by the belt drivrelieving the frictional drag of the driving belt. ing the same.

Another disadvantage found in rewinding when Briefly my invention comprises a motion picthe take-up reel is pivotally mounted to float ture projector wherein the take-up reel is jourand be supported by a driving belt, arises from nalled on an arm which is pivotally mounted to the fact that when the drive is first switched the projector housing so as to be normally sup- 4 to the supply reel, before the combined moment ported by a belt which drives the take-up reel.

of the take-up reel and the drag thereon caused The starting and stopping of the rewind mechby the belt can be overcome, the take-up reel anism is controlled by moving a lever pivoted to tends to fly upwardly due to the pull of the film. the housing of the projector. The arm on which Although this tendency is greatest at the beginthe take-up reel is mounted is connected to the ning of the rewinding operation, it is prevalent lever by a bracket, said bracket being pivoted throughout the rewinding operation pending a to the arm, and having a pin and slot connection momentary catch in the free movement of the with the lever. The bracket, through its pin and take-up reel. When the take-up reel does fly slot connection with the lever, is adapted to serve upwardly for any reason, and then is quickly rethree functions, namely: as a supplementary leased, a slack is allowed in the film strip besupporting means for the take-up reel should the 50 tween the two reels which allows the take-up reel driving belt normally supporting the reel break to drop back down suddenly, until it is supported or jump off of a pulley; to allow the movement again by the driving belt therefor. This sudden of the lever beyond its rewind starting position rise and fall of the take-up reel places a sudden to raise the take-up reel and relieve the frictional shock on the film strip between the two reels drag between the reel and its driving belt; and 55 methods of operation, together with additional objects and advantages thereof, will best be understood from the following description of specific embodiments when read in'connection with the accompanying drawings in which:

Fig. 1 is a front elevation of a motion picture projector, with certain parts broken away to show the preferred form of my invention,

Fig. 2 is a partial view of Fig. 1 and showing the take-up spindle folded into carrying position within the projector housing,

Fig. 3 is an enlarged detail of the button for actuating the belt shifter indicated in Fig. 1.

Fig. 4 is a partial side elevation of the projector showing the take-up spindle folded into the projector housing,

Fig. 5 is a partial side elevation of the projector showing the take-up spindle supported by its driving belt, and showing the position of the rewind motor for driving the supply spindle,

Fig. 6 is an enlarged side elevation of the rewind switch and its operating lever, and showing the lever in the position wherein it has assumed control of the bracket pivoted to the take-up spindle arm so that the take-up spindle has been raised to relieve the frictional drag thereon due to the driving belt, and

Fig. 7 is front elevation of the projector showing the supply reel in rewind position.

Fig. 8 is an enlarged end elevation of the belt shifter, with parts of the purposes of clarity; and showing the fingers on the shifter as well as the two step cone drive pulleys over which the shifter moves the belt.

Fig. 9 is an enlarged section through the support for the supply reel and the housing enclosing the rewind drive mechanism clearly showing the driving connection between the rewind motor and the supply spindle.

Fig. 10 is an enlarged section taken on line III-.III of Fig. 1 and showing the eccentricity of the stud I56.

Like reference characters refer to corresponding parts through the several figures.

Refen'ing now to Fig. 1, wherein a preferred embodiment of my invention is shown, III represents the housing of the projector, preferably within which is arranged the film feeding, light controlling, and other kindred mechanisms usual to a projection apparatus.

A tubular support If for the supply reel I3 is rotatably mounted on the projector housing l0 so that it can be folded down against the housing, as shown by the dotted position thereof in Fig. '7, the supply spindle i4 and its associated gear housing l5 being received in the recess 16 of the projector housing.

The supply spindle I 4 is suitably mounted on top of the support I2 so that it can be swung through 90 from a projecting position wherein it is at right angles to the take-up reel, to a rewind position, see Fig. 7, wherein it is in alignment with the take up reel I! so that rewinding of the film F can take place directly from reel to reel externally of the housing. For rewinding understood by projector omitted for -member 61 and the supply rotate idly. It necessarily follows that when the- 'for carrying purposes, the drive for the supply spindle includes rewind motor 80, driving belt 80, pulley 6|, shaft 00 and bevel gears 62 and ",see Figs. 1, 7 and 9. Bevel gear 08 is fixed to the end-of a power shaft 64 which extends into the end of the tubular support l2, the end of the support l2 having a male clutch fixed thereto. The supply spindle II has a bevel gear 12 fixed thereto which engages another bevel gear 15 fixed to the. drive shaft, II, which extends into the upper end of the support I2, and has on its end a female clutch member, 16, which is adapted to engage the above mentioned male clutch member 61 when the supply spindle is in its rewind position to connect the spindle with the drive from the rewind motor 00, as will be referring to Fig. 9. The supply spindle I4 is so mounted atop thesupport II, that when it is rotated between its rewind and projecting positions the drive connection between it and the rewind motor is automatically efi'ected or broken by causing the female clutch member 10 to be moved into or out of engagement with the male clutch member 61 respectively. In Fig.9 the support I 2 is shown rotated to the position where the, supply spindle I4 is in projecting position hence the female clutch member 16 is removed from engagement with the male clutch spindle is allowed to mber. 6

support I! is rotated to the position shown in Fig. 7, wherein the supply spindle i4 is in position for rewinding, that the female clutch member 16 drops down in the support I2 to engage the male clutch member 61 whereby the supply spindle is driven to pull the film from the take-up reel H. A detailed description of the mounting of this supply spindle can be had by referring to said pending U. S. application 74,330 to E. C. Fritts, Patent No. 2,099,299 but in as much as this feature forms no part of my-invention a detailed description will be dispensed with in this specification.

In its take-up position, the take-up reel I l is mounted to one side of and at right angles to the objective l8 and the film path of the projector so that the film F on leaving said film feeding mechanism has to be turned through 90 degrees to be guided onto the take-up reel. In order to provide this 90 turn in the film path, a guide roller l9 which is movably mounted on the housing ill by screws 20 and bracket 2| is provided, said bracket being formed as at 22 to enclose one side of the roller to prevent the film from running 01! thereof.

The take-up spindle 25 is so mounted on the projector housing i 0 that it is adapted to be folded and swung into a recess 26 in the housing purposes, see Figs. 2 and 4. The mounting for the take-up reel comprises an arm 21 which is rotatably pinned at one end to the housing II by the bolt 28. The other end of the arm 21 provides a yoke member 29 into which a lug 30 on the take-up spindle casing 3| projects and is rotatably confined by a tie bolt 32 passing through the two. Therefore, by virtue of the described mounting, the take-up spindle 25 is adapted to be folded into the carrying position shown most clearly in Fig. 4.

I Those parts of the projector described up to this point are identical with the corresponding parts of the projector shown in said pending application Serial No. 74,330, Patent No. 2,099,299 and the reference characters used in the present specification have been made to correspond to shaft :4 within the the pulley I03 so that shaft I00, and is driven with two sets of belt the reference characters used in the referred to pending application wherein a detailed description of the parts and their function may be found.

To drive the take-up spindle, a pulley 35 is fastened to a shaft 38 which is journalled in the housing I0, see Fig. 5. Shaft 36 is in turn geared, in any suitable manner, not shown, to shaft I00 which is journalled in the housing at right angles to shaft 36,, see Fig. 1. Referring to Figs. 1 and 9, a two step cone pulley IN is fixed to the end of from another two step cone pulley I03, fixed to the end of the drive shaft I04 of, the motor I05, mounted in the housing IIO, by means of belt I06. In order to shift the belt I05 on the pulleys IOI and I03, a belt shifter, indicated broadly as, I01, is provided. This belt shifter, comprises a pair of arms I08 mounted in spaced parallel relation on a pin I09 which is slidably'mounted in a bore in the partition IIO whereby the arms are adapted to engage the belt I06 on opposite edges. The arms I00 are provided engaging fingers II I and I I2,.fingers I I I engaging the belt adjacent pulley IOI, and fingers II2 engaging the belt adjacent an even pressure is applied to the belt in shifting from one speed to another, thereby overcoming the necessity for'the belt to climb from one pulley to another as is the case where well known localized belt shifters are used. A guide roller I I5 is journalled between the parallel arms I08 to act asa guide and tensioning members for the belt. A

The belt shifter IIllis actuated by pressing in or pulling out the button H6. Referring now to Fig. 3, stud I I1, having a burred end I I0, is driven into a hole H9 in the pin I09 so that it is prevented from turning therein. The stud IILhas an enlarged central portion I20 on which the button H5 is slidably and rotatably mounted. Button H5 is provided with a stepped recess I2I, in which a coiled spring I22, encircling the stud III, is adapted to be seated. A disc I23 is fixed to the end of the stud to maintain the spring I22 in place wherein it normally forces the button 'II5 towards the partition IIO whereby a tapered end I20 of thebutton is adapted to be seated in a recess in the partition to hold the belt shifter in any given position. When it is desired to move the belt shifter, button H6 is pulled outward against the spring I22 until the disc I23 engages the reduced portion of the recess I2 I, whereupon the button is removed from the recess in the partition and the shifting pin I09'can be slid-one way or another.

The take-up spindle 25 is driven from the pulley 35 by a belt 31 which passes from pulley 35 over pulley 30 which is fixed to the take-up spindle. Due to the relative positions of the driving pulley 35, and the pulley 38 on the take-up spindle when said spindle is in its take-up position, and in order to allow the take-up reel I1 to float with respect to its pivot point 28 so that the Weight of the film on the reel can control the friction in the driving belt during take-up, I mount a pair of guide pulleys 40 and II on the housing I0, These pulleys are angularly mounted so that they properly change the direction of the driving belt 31in order to effect a proper power transmission to the take-up spindle from the main source of power, the motor I05. The pulleys 00 and II also serve to direct the belt 31 so that it suspends the take-up spindle 25 whereby the belt friction will be controlled by the change in weight of the take-up reel.

The particular construction of the projector described up to this point is forthe most part old in the art, a detailed description thereof being made in pending application Serial No. 74,330, Patent No. 2,099,299 referred to above, and has been merely used to illustrate a type of projector on which my invention, to be described hereinafter, is particularly adapted.

A rewind switch I is mounted in the recess 26 in the housing I0, said switch controlling an electric circuit for starting and stopping of the rewind motor 60 which is connected to the supply spindle as above described. The switch I50 is provided with a toggle lever I5I which has a round head, for the purpose hereinafter described. A controlling lever I52 is pivoted at I52 to the housing I0, and this lever extends through a slot in the partition 42, forming one wall of the recess 25, so that it is easily accessible for operation.

The controlling lever I52 is provided with upstanding lugs I53 and I54 which engage opposite sides of the toggle lever I5I when the controlling lever I52 is in the position shown in Figs. 1 and 2 wherein the rewind switch is shut off When lever I52 is pulled downward, to the dotted position B, see Fig. 6, lug I54 engages the toggle lever I5I and closes the switch I50. When rewinding iscompleted. controlling lever I52 is returned to its inoperative position and in so moving, lug I53 thereon engages the toggle lever I5I and opens the switch I50. Bracket or strap I55 has one end pivoted to the take-up arm 21 by means of an eccentric stud I55, see Fig. 10 for purposes hereinafter described. The other end of the bracket is provided with an elongated slot I51 which engages a pin I58 mounted on the end of controlling lever I52. As shown in Figure 1, when the controlling lever I52 is in its inoperative position the pin I58 thereon is midway between the ends of the slot I51 to allow a given amount of movement to the lever I52 before said lever assumes control of the take-up arm 21 through the bracket I55. When rewinding is desired, lever I52 is moved to the dotted position B such movement being sufficient to cause lug I55 on the lever to engage toggle lever I5! and close the rewind switch I50. The length of the slot I51 is such that the pin I58 on the lever I52 moves only to the end I59 thereof, when the lever I52 is moved a sufficient distance to close the switch.

In order to remove the frictional drag between the driving belt 31 and the pulley 38 on the takeup spindle 25 during the rewinding operation, controlling lever I52 is moved to and held in its lowest position shown in Fig. 6 wherein the pin I50 on the lever has assumed control of the bracket I55 to lift the take-up arm 21 and its associated mechanism. After sufiicient film has been removed from the take-up reel II, the controlling lever I52 can be released by the operator to allow it to return to the position B under the action of the weighted arm 21 acting through bracket I55, in which position the switch I50 is left closed so that rewinding can continue until finished. It will be noted by referring to Fig. 6 that when the controlling lever I52 is moved to its lowest position, the lug I55 is adapted to cam itself past the rounded head on the toggle lever I5I.

If at the start or during rewinding the take-up arm 21 and its associated mechanism tend to fly upwardly due to a momentary drag between the film strip and the take-up reel I1, the pin I58 will engage the end I50 of the slot I51 to prevent such an upward movement of the take-up arm. A slight amount of upward movement is allowed the take-up arm and its associated mechanism by virtue of the pin and slot connection between the bracket I55 and the pin I58 to account for momentary shocks to which the film strip might be subjected during rewinding, but said pin and slot connection is such as to prevent the take-up reel from flying upwardly to a position from which a drop would induce a sufllcient shock upon the film strip to rupture the same. In order to change the efiective length of the bracket I 55, the pivoted connection between it and the takeup arm 2'! has been made with an eccentric stud I56 an adjustment of which will shift the bracket in a direction to change the relative positions of the slot I51 and the pin I58, see Fig, 10. By means of this adjustment the pin and slot connection I51 and I58 can be so altered as to make the controlling lever I52 assume control of the bracket I56 at any position of its movement that may be desired.

In order to allow the take-up arm and its associated mechanism to be folded within the recess 26 for carrying purposes, as shown in Figs. 2 and 4, without necessitating a disconnection of the bracket I 55 and the control lever I52, I have provided the bracket I55 with an elongated slot I6I which connects with elongated slot I5I. When it is desired to fold the arm 21 into the recess 26, the bracket I55 is raised by the operator with his finger to guide the pin I58 into the slot I6I after which said pin will travel in the slot ISI as the arm 21 is folded.up, and will assume a position as shown in Fig. 2.

Bracket I55 in addition to serving the purposes already described, also serves as a supplementary supporting means for the take-up arm and the take-up reel thereon in the event the driving belt SI'breaks or jumps a pulley. By virtue of the pin and slot connection I58 and I5! between the bracket and the control lever I52, the takeup arm 21 and the reel I1 thereon is allowed to float over a range whereby the driving belt 31 normally acts as the sole means of support for the arm and reel thereon. However, if the belt 31 should break or jump a will only drop until the pin I58 engages the end I59 of the slot I51 whereupon the bracket I55 becomes the support for the take-up arm and the reel thus preventing it from dropping down against the projector housing I8.

Although I have shown and described certain specific embodiments of my invention, I am aware that many modifications of the same are possible. My invention, therefore, is not to be restricted except in so far as is necessitated by the prior art and by the spirit of the appended claims.

- Having thus described my invention, what I declare is new and desire to secure by Letters Patent is:

1. A motion picture projector comprising a support, a supply reel mounted thereon, a take-up arm pivotally mounted on the support, a take-up spindle journalled on said arm, a take-up reel mounted thereon, frictional driving means for the take-up spindle normally supporting the takeup arm and its associated parts whereby the frictional engagement between the spindle and the driving means therefore varies with the weight of film on the take-up reel, rewinding mechanism on the support for driving the supply spindle while the take-up spindle is idle, a pivoted lever on the support, a means connecting said lever and the take-up arm whereby the arm is prevented from flying upwardly during rewinding and the take-up arm may be raised by moving pulley, the arm 21- said lever to relieve the frictional engagement between the take-up spindle and its driving means, said means including a strap having one end connected with said lever and the other end pivoted to the take-up arm, the normal effective length of said strap being insufiicient to supplement the frictional driving means as a support for the take-up arm and its associated parts.

2. A motion picture projector comprising a support, a supply reel mounted on take-up spindle pivotally mounted on one side ofsaid support, a take-up reel mounted thereon, means for frictionally driving said take-up spindle, said means normally supporting the weight of the spindle and the take-up reel thereon, mechanism on said support for effecting a rewinding of a film strip from the take-up reel to the supply reel, a lever for starting and stopping the rewinding mechanism, and a connection between said lever and the take-up spindle whereby the frictional engagement between the take-up spindle and its driving means can be relieved by moving said lever.

3. A motion picture projector comprising asupport, a supply reel mounted on said support, a take-up spindle pivotally mounted on one side of said support, a take-up reel mounted thereon, means for frictionally driving said take-up spindle, said -means. normally supporting the weight of the spindle and the take-up reel, rewinding mechanism on the support for driving the supply reel while the take-up spindle is idle, a lever for starting and stopping said rewinding mechanism, and a connection between said lever and the take-up spindle whereby the take-up spindle may be raised by moving the lever, and the take-up spindle may be prevented from flying upward during rewinding.

4. A motion picture projector comprising a housing, a supply reel mounted thereon, a take-up arm pivotally mounted on the side of said housing, a take-up spindle journalled on said arm, a take-up reel on said spindle, means for frictionally driving the take-up spindle, said means normally supporting the weight of the spindle and the take-up reel thereon whereby the driving friction varies with the amount of film on the reel, a, rewind mechanism for driving the supply reel, a control lever for starting and stopping the rewind mechanism, and a bracket having one end pivoted to the take-up arm, and other end connected to the control lever whereby the arm and the take-up spindle may be raised by moving the lever to relieve the frictional engagement between the take-up spindle and its driving means.

5. A motion picture projector comprising a housing, a supply reel mounted thereon, a take-up arm pivotally mounted on the side of said housing, a take-up spindle journalled on said arm, a takeup reel on said spindle, means for frictionally driving the take-up spindle, said means normally supporting the weight of the spindle and the take-up reel thereon whereby the driving friction control lever for starting and stopping the rewind mechanism, a pin on said control lever, and means connecting the control lever and the take-up arm whereby the take-up arm is prevented from flying upward during rewinding and said arm can be raised upon movement of the control lever to relieve the frictional engagement between the take-up spindle and its driving means, said means including, a bracket having one end slotted to engage the pin on the control lever, the other end housing, a supply reel mounted thereon,

of said bracket being pivoted to the take-up arm.

6. A motion picture projector comprising a a take-up arm pivotally mounted on the side of said housing, a take-up spindle journalled on said arm, a takeup reel on the spindle, a pulley fixed to the end of said spindle, a belt engaging the pulley for driving the spindle, said belt normally supporting the take-up arm and its associated parts whereby the frictional engagement between the pulley and the belt varies with the weight oi! the take-up reel, 9. rewind mechanism for driving the supply reel, a control lever for starting and stopping the rewind mechanism, and means connecting said control lever and said take-up arm whereby a movement of the lever will raise the take-up arm and relieve the frictional engagement between the take-up spindle and the driving belt, said means including a bracket having one end connected with the control lever, and the other end pivoted to the take-up arm.

7. A motion picture projector comprising a housing, a supply reel mounted thereon, a takeup arm pivotally mounted on the side of said housing, a take-up spindle journalled on said arm, a take-up reel on the spindle, a pulley fixed to the end of said spindle, a belt engaging'the pulley for driving the spindle, said belt normally supporting the take-up arm'and its associated parts whereby the frictional engagement between the pulley and the belt varies with the weight of the take-up reel, a rewind mechanism for driving the supply reel, a control lever for starting and stopping the rewind mechanism, and means connecting said control lever and said take-up arm whereby a movement of said lever will raise the take-up arm and relieve the frictional engagement between the take-up spindle and the driving belt and will prevent the take-up arm from flying upwardly during rewinding, said means including a pin on the control lever, and a bracket having one end pivoted to the take-up arm, the other end of the bracket having an elongated slot engaging said pin on the control lever.

8. A motion picture projector comprising a housing, a supply reel mounted thereon, a take-up arm pivotally mounted on the side of said housing, a take-up spindle journalled on said arm, a takeup reel on the spindle, a pulley fixed to the end of said spindle, a belt engaging the pulley for driving the spindle, said belt normally supporting the take-up arm and its associated parts whereby the frictional engagement between the, pulley and the belt varies with the weight of the take-up reel, a rewind motor in said housing for driving the supply reel, a switch for starting and stopping said motor, a lever pivoted to the housing for operating said switch, a pin on said lever, and means connecting the lever and the take-up arm whereby the arm is prevented from flying upwardly during rewinding and is lifted by moving the control lever, said means including a bracket having one end pivoted to the take-up arm, the other end of the bracket having an elongated slot engaging the pin on the control lever.

9. A motion picture projector comprising a housing, a supply reel mounted thereon, a takeup arm pivotaliy mounted on the side of said housing, a take-up spindle journalled on said arm, a take-up reel on said spindle, a pulley fixed to the end of said spindle, a belt engaging the pulley for driving the spindle, said belt normally supporting the take-up arm and its associated parts whereby the frictional engagement between the pulley and the belt varies with the weight of the take-up reel, a rewind mechanism for driving the supply reel, a control lever for starting and stopping the rewind mechanism, a pin on said control lever, a supplementary supporting means for the take-up arm including a bracket having one end slotted to engage the pin on the control lever, the other end of the bracket being pivoted to the take-up arm whereby a movement of the control lever is adapted to lift the take-up arm and relieve the frictional engagement between the driving belt and the pulley of the take-up spindle, and means for varying the effective length of the supplementary supporting means with respect to the length of the driving belt, said means including a cam member at the pivot \point of the bracket and the take-up arm.

10. A motion picture projector comprising a housing, a supply reel mounted thereon, a takeup arm pivotally mounted on said housing to move between a carrying position wherein it is within the housing to an operative position wherein it is outside the housing, a take-up spindle joumalled on said arm adapted to receive a take-up reel, a pulley fixed to the end of said spindle, a belt engaging the pulley for driving the spindle, said belt normally supporting the take-up arm and its associated parts when said arm is in its operative position, a rewind mechanism for driving the supply reel, a control lever for starting and stopping said rewind mechanism, a pin on said control lever, and means connecting the control lever and the takeup arm whereby the take-up arm is prevented from flying upwardly during rewinding, and said arm may be raised upon movement of the control lever to relieve the frictional engagement between the take-up spindle and, its driving belt, said means including, a bracket having one end slotted to engage the pin on the control lever, and the other end pivoted to the take-up arm.

11. A motion picture projector comprising a housing, a supply reel mounted thereon, a takeup arm pivotally mounted on. the side of said housing, a take-up spindle journalled on said arm, a take-up reel on the spindle, a pulley fixed to the end of said spindle, a belt engaging the pulley for driving the spindle, said belt normally supporting the take-up arm and its associated parts whereby the frictional engagement between the pulley and the belt varies with the weight of the take-up reel, an electric motor mounted in said housing and adapted to drive the supply reel for rewinding purposes, a switch for controlling said motor, a control lever pivoted to the wall ofthe housing adapted to open and close said switch, and means connecting said control lever and said take-up arm whereby a movement of the lever beyond its switch actuating position will raise the take-up arm and relieve the frictional engagement between the take-up spindle and the driving belt,'said means including a bracket having one end connected by a pin and slot connection with the control lever, and the other end pivoted to the take-up arm.

12. In a motion picture projector the combination with a support, a supply reel mounted thereon, a take-up arm pivotally mounted on the support, a spindle journalled thereon, a take-up reel on said spindle, frictional driving means for said spindle, said driving means normally supporting the take-up arm and its associated parts whereby the frictional engagement varies with the weight of film on the take-up reel, a rewind mechanism for driving the supply reel, :1 upon failure of the frictional driving means to act control lever for starting and stopping said reas a support. said means comprising a. bracket wind mechanism, 01' a means connecting the having one end connected to the control lever take-up arm, and the control lever whereby the through a. pin and slot connection, the other end arm may be raised upon movement 01 the lever, of said bracket beinz pivoted to the take-up arm. 5 the arm is prevented from flying upwardly during rewlndinx, and the arm is supported thereby O'I'IO WI'I'I'EL. 

